Hudson Bay Capital Management’s X4 Pharmaceuticals XFOR Stock Holding History

Hudson Bay Capital Management’s Portfolio XFOR Stock Details XFOR Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$208K	Buy	50,287 +18,048	+56%	+$67.6K	﹤0.01%	1095
2025 Q4	$129K	Buy	+32,239	New	+$117K	﹤0.01%	1000
2024 Q3	–	Sell	-7,575	Closed	-$132K	–	1063
2024 Q2	$132K	Buy	+7,575	New	+$248K	﹤0.01%	669
2021 Q4	–	Sell	-1,530	Closed	-$243K	–	1215
2021 Q3	$243K	Sell	1,530 -4,217	-73%	-$694K	﹤0.01%	855
2021 Q2	$1.08M	Hold	5,747	–	–	0.01%	718
2021 Q1	$1.38M	Buy	+5,747	New	+$1.51M	0.02%	634

Other funds holding XFOR

Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

EAM

Empery Asset Management New York $83M AUM

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

BCLSI

Bain Capital Life Sciences Investors Boston, Massachusetts $1.11B AUM 171.34% 1-Year Est. Return

Perceptive Advisors New York $5.12B AUM 314.02% 1-Year Est. Return

SVCM

Saturn V Capital Management Austin, Texas $552M AUM 551.78% 1-Year Est. Return

DTC

Deep Track Capital Greenwich, Connecticut $6.12B AUM 144% 1-Year Est. Return

KCM

Kalehua Capital Management Dallas, Texas $141M AUM

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

Braidwell Stamford, Connecticut $3B AUM 46.72% 1-Year Est. Return

Hudson Bay Capital Management's XFOR Position: Q1 2026 in Review

Hudson Bay Capital Management increased its X4 Pharmaceuticals (XFOR) stake by 56% in Q1 2026, buying an estimated $67.6K and bringing the position to 50,287 shares worth $208K. The position accounts for ﹤0.01% of the portfolio, ranked #1095.

Hudson Bay Capital Management first reported a position in XFOR in Q1 2021 and has held it in 6 quarters since. The position peaked at $1.38M in Q1 2021. 84 funds tracked by Wall St. Rank hold XFOR as of Q1 2026.

Hudson Bay Capital Management held 50,287 shares of X4 Pharmaceuticals worth $208K as of Q1 2026.
Hudson Bay Capital Management bought 18,048 X4 Pharmaceuticals shares in Q1 2026, an estimated $67.6K.
X4 Pharmaceuticals made up ﹤0.01% of Hudson Bay Capital Management's portfolio in Q1 2026, its #1095 holding.
Hudson Bay Capital Management first reported a position in X4 Pharmaceuticals in Q1 2021 and has held it in 6 quarters since.
Hudson Bay Capital Management's X4 Pharmaceuticals position peaked at $1.38M in Q1 2021.
84 funds tracked by Wall St. Rank held X4 Pharmaceuticals as of Q1 2026.

Based on Hudson Bay Capital Management's 13F filing for Q1 2026, filed 13 May 2026.